o ןi@s^dZddlmZddlmZmZGdddeZGdddZGdd d Z Gd d d Z d S) z] Useful auxiliary data structures for query construction. Not useful outside the SQL domain. ) FullResultSet)INNERLOUTERc@seZdZdZddZdS) MultiJoinz Used by join construction code to indicate the point at which a multi-valued join was attempted (if the caller wants to treat that exceptionally). cC||_||_dSN)levelZnames_with_path)selfZ names_posZpath_with_namesr mC:\Users\psant\Downloads\Anu Raj Backend\school\venv\Lib\site-packages\django/db/models/sql/datastructures.py__init__s zMultiJoin.__init__N)__name__ __module__ __qualname____doc__r r r r r r s rc@s eZdZdS)EmptyN)r rrr r r r rsrc@s`eZdZdZ dddZddZddZed d Zd d Z d dZ ddZ ddZ ddZ dS)Joina Used by sql.Query and sql.SQLCompiler to generate JOIN clauses into the FROM entry. For example, the SQL generated could be LEFT OUTER JOIN "sometable" T1 ON ("othertable"."sometable_id" = "sometable"."id") This class is primarily used in Query.alias_map. All entries in alias_map must be Join compatible by providing the following attributes and methods: - table_name (string) - table_alias (possible alias for the table, can be None) - join_type (can be None for those entries that aren't joined from anything) - parent_alias (which table is this join's parent, can be None similarly to join_type) - as_sql() - relabeled_clone() NcCs8||_||_||_||_||_||_||_||_dSr) table_name parent_alias table_alias join_typeZget_joining_columns join_cols join_fieldnullablefiltered_relation)r rrrrrrrr r r r -s   z Join.__init__c Cs8g}g}|j}|jj}|jD]\}}|d||j||||j||fq|j|j|j} | rF| | \} } |d| | | |j riz | |j \} } Wn t y\Yn w|d| | | |szt |jd|j} td| jd|} |j|jkrdnd|j}d|j||j|| f}||fS) z Generate the full LEFT OUTER JOIN sometable ON sometable.somecol = othertable.othercol, params clause for this join. z %s.%s = %s.%sz(%s)fieldzaJoin generated an empty ON clause. %s did not yield either joining columns or extra restrictions.z AND  %sz%s %s%s ON (%s)N)quote_name_unless_aliasopsZ quote_namerappendrrrZget_extra_restrictioncompileextendrrgetattr ValueError __class__joinrr)r compiler connectionZjoin_conditionsparamsqnZqn2Zlhs_colZrhs_colZ extra_condZ extra_sqlZ extra_paramsZdeclared_fieldZ on_clause_sql alias_strZsqlr r r as_sqlGs\     z Join.as_sqlc sr|j|j}|j|j}|jdur'|j}fdd|jjD|_nd}|j|j|||j|j |j |dS)Ncsg|]}||qSr )get).0p change_mapr r s z(Join.relabeled_clone..)r) r-rrrclonepathr%rrrr)r r1Znew_parent_aliasZnew_table_aliasrr r0r relabeled_clones"    zJoin.relabeled_clonecCs|j|j|j|j|jfSr)r%rrrrr r r r identitys z Join.identitycCt|tstS|j|jkSr) isinstancerNotImplementedr7r otherr r r __eq__  z Join.__eq__cC t|jSrhashr7r6r r r __hash__ z Join.__hash__cCs|jdd|jddkS)Nr7r;r r r equalssz Join.equalscC|i}t|_|Sr)r5rrr newr r r demote z Join.demotecCrGr)r5rrrHr r r promoterKz Join.promoter)r rrrr r,r5propertyr7r=rBrFrJrLr r r r rs ;   rc@sXeZdZdZdZdZdZddZddZddZ e d d Z d d Z d dZ ddZdS) BaseTablez The BaseTable class is used for base table references in FROM clause. For example, the SQL "foo" in SELECT * FROM "foo" WHERE somecond could be generated by this class. NcCrr)rr)r raliasr r r r s zBaseTable.__init__cCs2|j|jkrdnd|j}||j}||gfS)Nrr)rrr)r r'r(r+Zbase_sqlr r r r,s  zBaseTable.as_sqlcCs||j||j|jSr)r%rr-r)r r1r r r r5szBaseTable.relabeled_clonecCs|j|j|jfSr)r%rrr6r r r r7szBaseTable.identitycCr8r)r9rNr:r7r;r r r r=r>zBaseTable.__eq__cCr?rr@r6r r r rBrCzBaseTable.__hash__cCs |j|jkSrrEr;r r r rFs zBaseTable.equals)r rrrrrrr r,r5rMr7r=rBrFr r r r rNs  rNN) rZdjango.core.exceptionsrZdjango.db.models.sql.constantsrr ExceptionrrrrNr r r r s